Thyroid UK
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high fiber diet/levothyroxine

good evening,

i would like to be clarified if it is possible, whats the magnitude of a high fiber diet and levothyroxine absorption. i can talk about my personal case im a newbie vegetarian, and everybody knows that this diet include a lot of fiber in its menu,

my question is ofc related to this situation, i had made a lot of research concerning the impact of high fiber diet can have here, but i couldnt find in terms of percentage , what could be worst case scenario in terms of levo absorption?20%,? 30%?.......whats the real deal here

1 Reply


For maximum absorption Levothyroxine should be taken with water 1 hour before or 2 hours after food and drink, 2 hours away from other medication and supplements, and 4 hours away from calcium, iron, vitamin D supplements.

If you observe the above guidelines your diet will not impact on Levothyroxine absorption.

Please be aware that vegetarians and vegans cannot obtain B12 from plant foods and should supplement methylcobalamin with a B Complex vitamin to prevent B12 deficiency.


I am not a medical professional and this information is not intended to be a substitute for medical guidance from your own doctor. Please check with your personal physician before applying any of these suggestions.


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